Title page for ETD etd-11052009-182655


Type of Document Master's Thesis
Author Vezier, Clementine
URN etd-11052009-182655
Title Dynamics of Vortical Structures in a Low-Blowing-Ratio Pulsed Transverse Jet
Degree Master of Science in Mechanical Engineering (M.S.M.E.)
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Nikitopoulos, Dimitris Committee Chair
Acharya, Sumantha Committee Member
Guo, Shengmin Committee Member
Keywords
  • POD
  • film cooling
  • jet in crossflow
Date of Defense 2009-10-29
Availability unrestricted
Abstract
Large Eddy Simulation is used to study the interaction of a 35 inclined jet into a crossflow. Steady state cases, with a BR ranging from 0.150 to 1.2, are firstly examined to understand the dynamics of the flow field. Iso-surface of Laplacian of the pressure, vorticity contour and velocity fields highlight the presence of four main vortical structures: shear layer vortices, horse-shoes vortices, wake vortices and CRVP. Qualitative comparisons are performed between simulations and experiments.

The dynamics of the flow field is next characterized by pulsing the jet. The studied pulsed cases have same low BR and duty cycle respectively fixed at 0.150 and 50%. The presence of a vortex ring which evolves into a leading hairpin vortex is observed at the pulse. Good qualitative agreement is obtained between the numerical and experimental results.

Film cooling effectiveness, temperature contour and jet trajectory are extracted for both steady and pulsed cases. Overall, steady state cases provide better results in term of film cooling performance. POD is performed on steady and pulsed cases to obtain the dominant modes of the flow.

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